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Porous Si@C Ball-in-Ball Hollow Spheres for Lithium-ion Capacitor with improved energy and power density

Abstract

Rate capability of battery-type anode materials has become a great limitation to the energy and power density of lithium-ion capacitor. Besides the electronic conductivity, it is crucial to enhance the electrochemical rate by facilitating the diffusion and transportation of Li+. Herein, a new kind of porous Si@C ball-in-ball hollow structure was designed to build stable electrode-electrolyte interface, overcome the volume change of Si and enhance the mass diffusion and conductivity simultaneously. The obtained porous Si@C ball-in-ball hollow spheres as Si anode show great cycling stability in 1000 cycles and good rate capability with 943 and 586 mA h g-1 at 16.0 and 32.0 A g-1, respectively. As a result, lithium-ion capacitors based on porous Si@C ball-in-ball hollow spheres as anode materials give high energy densities of 239 and 154 W h kg-1 at the power densities of 1376 and ~69600 W kg-1, respectively. Furthermore, the lithium-ion capacitors also show a stable cycling performance in 15000 cycles at 6.4 A g-1.

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Publication details

The article was received on 04 Aug 2018, accepted on 28 Sep 2018 and first published on 05 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA07576J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Porous Si@C Ball-in-Ball Hollow Spheres for Lithium-ion Capacitor with improved energy and power density

    B. Li, S. Li, Y. Jin, J. Zai, M. Chen, A. Nazakat, P. Zhan, Y. Huang and X. Qian, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07576J

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